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something is wrong with my female black phantom tetra

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I think it was yesterday, when I saw my female bp tetra swimming at the top of my fish tank.her gills are flared out and she is acting like she cannot breathe
.all of the other black phantom tetras are doing fine but her she is also not eating

If the other fish in the tank are not showing symptoms then you can assume it is the lone fish. I have had this occur from injury during netting in the store. I also see a single fish suddenly behave like this after months in the tank.

To be safe, did you check ammonia, nitrite and nitrate? And temp?

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]

That being the case, maybe another member will have an idea if this is treatable, but in my experience it is not.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]

I belive Byron is on the right track and your fish got damaged in transportation, some of those clerks can be pretty rough.

Perfection is not attainable, but if we chase perfection we can catch excellence.
Once you learn to quit, it becomes a habit. -Vince Lombardi
“Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.” ― John WoodenSandy Hook Elementary......Lest We Forget
See my profile for my tanks and what fish I keep

Well Mike none of us want our fish to die but they do sometimes even with all our best efforts.

Turn out the lights for a day or two and maybe add some stress coat and see what happens.

Perfection is not attainable, but if we chase perfection we can catch excellence.
Once you learn to quit, it becomes a habit. -Vince Lombardi
“Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.” ― John WoodenSandy Hook Elementary......Lest We Forget
See my profile for my tanks and what fish I keep

Think with logic and rationality more than emotion. Act with moderation and consideration. Contemplate ideals and realistic goals and weigh out possibilities and options. Temper not with personal delusions or false hope but learn to accept and move on.